Herbs, perennial, ascending from filiform rhizomes. Stems erect, slender, 4-25 cm tall, 4-angled and narrowly winged, glabrous and smooth, only nodes slightly shortly hairy. Middle stem leaves opposite and with 2 leaflike but clearly smaller stipules in whorls of 4, at lower nodes stipules linear, 1.5-3 mm; petiole 1.5-10 mm; leaf blade membranous, suborbicular, broadly ovate to ovate-lanceolate, or elliptic-oblong, (5-)6-30(-40) × (3.5-)5-15(-23) mm, adaxially with scattered, ± appressed, short hairs, abaxially glabrescent, base attenuate, obtuse to truncate, margins antrorsely hispidulous-ciliolate, apex acute to rounded; single principal vein with 2-4 pairs of pinnate lateral veins. Inflorescences terminal and in axils of upper leaves with 3-11-flowered cymes; axes trichotomous and ± divaricate; bracts narrowly elliptic or ligulate, 0.8-3 mm; pedicels 1-3 mm. Ovary ovoid, ca. 0.5 mm, with undeveloped uncinate hairs. Corolla white, rotate, 2.5-3 mm in diam., lobed for 1/2-2/3; lobes ovate, obtuse, subapiculate to acute or acuminate. Mericarps ovoid, 1-2 mm, densely covered with uncinate yellowish brown trichomes 0.8-1 mm, on pedicels thickening and elongating up to 11 mm. Fl. May-Aug, fr. Jun-Sep.
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